(光景なら)a lively scene―(談話なら)―animated talk―(文体なら)―a vigorous style―(討論なら)―a spirited debate―(やり方なら)―an energetic way of doing things―(市場なら)―an active market
活気があること
活気がつく
with firmness
肝をいる
気になるもの
to have something in reserve―have something to spare
いさをある
気付いている
気懸りになる
気が狂っていること
He is touched―cracked―crack-brained―unsound in mind―not in his right mind―out of his mind―out of his wits―out of his senses―off his head―not right in his head―wrong in the upper story―His wits are wandering―His reason wanders.
気が楽になる
One's mind is on the stretch